history: add a browser test for confirm dialog focus regression.

chrome/browser/resources/history/history.js

Index: chrome/browser/resources/history/history.js
diff --git a/chrome/browser/resources/history/history.js b/chrome/browser/resources/history/history.js
index d57b119d8ba83da4edd8d730ed397f44bc883328..87bb0b07d7c398d09777d52b46e324783f0737ed 100644
--- a/chrome/browser/resources/history/history.js
+++ b/chrome/browser/resources/history/history.js
@@ -1976,6 +1976,7 @@ function showConfirmationOverlay() {
   $('alertOverlay').classList.add('showing');
   $('overlay').hidden = false;
   $('alertOverlayCancel').focus();
+  $('history-page').setAttribute('aria-hidden', 'true');

[Evan Stade, 2014/09/23 20:46:30]

is this related to the CL desc?

[Dan Beam, 2014/09/23 20:48:42]

yeah, because it's required to pass the browser tests (a11y audit is on)

   uber.invokeMethodOnParent('beginInterceptingEvents');
 }
 
@@ -1985,6 +1986,7 @@ function showConfirmationOverlay() {
 function hideConfirmationOverlay() {
   $('alertOverlay').classList.remove('showing');
   $('overlay').hidden = true;
+  $('history-page').removeAttribute('aria-hidden');
   uber.invokeMethodOnParent('stopInterceptingEvents');
 }